Protection Fuse; Standards - Pegasus GRT7-TH4 R2 Manual De Instalación, Operación Y Mantenimiento

5 PROTECTION FUSE

The fuse is used to limit the input current supply in order to extinguish the current in case of failure, avoiding major
problems. The GRT7-TH4 R2 regulator possesses a rectifier that controls the field voltage of the alternator. For the
maximum field voltage, the supplied current at input "3" is half of the field current, and the maximum current of the fuse
should be a little more than half of the current supplied by the regulator. Listed below are some of the fuse
characteristics:
Recommended manufacturer: LittelFuse
Characteristics: Fast action fuse.
Dimensions: 5x20 mm.
Current/Voltage: 3A/250V for 5A model or 5A/250V for 7A model (Table 4.1).
Time for opening (to blow):
% of maximum current

6 STANDARDS

The GRT7-TH4 R2 voltage regulators comply with the following international standards:
Standard
IEC 61000-4-5 – Surge immunity test
IEC 61000-4-4 - Electrical fast transient/burst immunity
test
IEC 61000-4-3 – Radiated, radio-frequency,
electromagnetic field immunity test
IEC 61000-4-2 - Electrostatic discharge immunity test
IEC 61000-4-11 - Voltage dips, short interruptions and
voltage variations immunity tests
IEC 61000-4-6 - Immunity to conducted disturbances,
induced by radio-frequency fields
Table 5.1: Fuse opening time
Fuse opening time
110%
135%
200%
Table 6.1: Standards
10V/m field for a frequency range from 80MHz to 1GHz. A
10% maximum variation is allowed at the output voltage for a
radiated frequency between 160MHz and 280MHz. For all
other frequencies the equipment doesn't present variations
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Opening time
4 hours (minimum)
Max. 1 hour
Max. 1 second
Level
Asymmetrical: 4kV Symmetrical: 4kV
5Khz repetitions, +/- 2kV peak voltage
Contact: 4kV load;
Through the air: 8kV load.
Dip f 30db to 95db dips
10V amplitude, 150kHz to 80Mhz
Automatic Voltage Regulator – GRT7-TH4 R2 l 17
Performance
Criteria
B
B
A
B
C and B
A